Double-ended marking pen



FIG. 1 is a side elevational view of a double-ended marking pen in accordance with our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a side elevational view of the double-ended marking pen with the cap members removed for clarity of illustration, all other sides being identical thereto;

FIG. 7 is a top plan view of FIG. 6; and,

FIG. 8 is a bottom plan view of FIG. 6; 

The ornamental design of a double-ended marking pen, as shown. 